<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Document</title>
</head>
<body>
<ul>
	<li></li>
	<li></li>
	<li></li>
	<li></li>
	<li></li>
</ul>
<script>

	var a = document.getElementsByTagName('li');
	var b = document.createElement('div');
	// alert(Object.prototype.toString.call(a))
	var c = Array.prototype.slice;
	// var a = [1,2];
	c.call(a);
	console.log(a)
</script>
</body>
</html>